(((((((Elizabeth)))))))
I think that after 3 weeks of treatment, your father won't be ready to talk about any issues. Right now, his main focus is on staying sober. He's very early in recovery and it will be a while before he's ready to start dealing with the reality of what his drinking has resulted in over the years. In fact, he may never be ready to talk about it. My dad has been sober for 12 years, and not once have we had any kind of meaningful conversation about how his drinking affected any of us.
I think just being there and being supportive will be all that's required. And even if he does try to start making amends, you can politely tell him that you're not ready to talk about it yet.
I hope you have a nice visit.
Hugs,
JG